Question

In Young’s double slit experiment, the distance between the slits is 0.2 mm and the distance of the screen from the slits is 2 m. If light of wavelength 500 nm is used, find the number of fringes formed between two points separated by 1 cm on the screen.

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

$y=n\beta$
Here $\beta =\frac{\lambda D}{d}=0.5cm$
2 fringes.